I believe that deficiencies in Episodic Memory can be related to Aphantasia.

My hypothesis is that when people with high mental image visualization recall an event, they are re-experiencing it in a sense, and therefore reinforcing its details (or details as remembered, at least!). A person with aphantasia recalling that event does not re-experience it in a way that triggers this feedback loop, not as efficiently or completely at least.

I have very detailed memory about facts, places that I've been and seen, including spatial models; but how many times I've visited a place, who I was with on which trip, which events occurred on which visit, these details quickly become obscured and lost.